Method of producing carburetor jets



Jan. 20, 1931. A. 1 WEATHERH EAD, JR 1,739,719

METHOD OF PRODUCING CARBURETOR.JETS

Filed March 19, 1929 2 Sheets-Sheet 1 INVENTOFI Jan. 20, 1931. A. J. WEATHERHEAD, JR 1,789,719

METHOD OF PRODUCING CARBURETOR JETS Filed March 19. 1929 2 Sheets-Sheet 2 FIE-9 FIE-J2 3 V [llI/l/I/I/A zllll l lll/ INVENTOR 17 J- WEATHER/15w .7?

- ATTORNEY Patented Jan. 20, 1931 UNITED STATES PATENT OFFICE METHOD OF PRODUCING CARBUBETOR JETS Application filed March 19, 1929. Serial No. 348,296.

with each other and with the axls of the flaring mouth. Mis-alignment of these openings, in even slight degree, gives objectional results or produces malfunction in a carburetor, and the present steps of manufacture have been devised to eliminate faulty production and at the same time expedite the making of such jets in large quantities.

The jet itself, and the steps taken to produce the same, are substantially as delineated in the accompanying drawings, in which Fig. 1 is a side view of the jet, enlarged as compared with its actual size. Figs. 2 to 11, are

side and sectional views illustrating the successive stages of manufacture from a solid bar or rod, Figs. 2 and 3, being side and end views, respectively, of a hexagonal rod; Fig. 4 is a side elevation of the same rod turned down in part; Fig. 5 a side elevation corresponding toFig. 4 with a screw-thread de-v veloped thereon; Fig. 6 asectional View showing the turned part and also an unturned part of the rod drilled axially; Fig. 7 a view corresponding to Fig. 6 but showing the bore reamed to a slightly different shape; Fig. 8

a sectional view of the rod and a partially completed jet severed therefrom Fig. 9 a sec- 4 tional view of the same jet sleeved upon an arbor and being operated upon by a drill to form the jet orifice; Fig. 10 a sectional .view of the drilled jet sleeved upon a centering de- A vice and being machined at the tip concentric with the orifice axis; and Fig. 11 a sectional View of the jet showing its. machined tip sleeved within a tool for producing a flaring mouth at the jet orifice. Fig. 12 is an enlarged sectional view of the finished tip of the jet.

In practicing the present method of manufacturing carburetor jets or nozzles, the first operations involve the use of an automatic screw machine through which bar or rod stock is fed at intervals and rapidly'rotated while suitable tools are brought. into engagement with the rod toform the desired object or product. In the present instance, a hexagonal rod A of brass is fed through the machine, and the first operation consists in turning an end portion of the rod to a cylindrical shape for a predetermined distance, leaving a part athereof in its original stateand producing a short connecting neck ,b between part a and the main body of the rod. The next operation involves the formation of a screw-thread c-- between part a and the outer end of the reduced stem portion --d, which thread may be rolled into the stock. A gun drill is then brought axially in line with .the screw-threaded stem and fed forward at intervals to produce an axial bore ethroughout the length of the turned stock and beyond that into the solid rod to a predetermined depth. A reaming tool is then introducedinto the bore which finishes the bore to the diameter desired and tapers the inner end fe thereof. The neck .Z) of the rod is now engaged by a swing" tool which turns down the body of the rod for a predetermineddistance to the same diam: eter as neck -b and then to a still smaller diameter opposite the tapered portion.-f of the bore and for a short distance beyond the inner end thereof. In this operation the rod is fed forward in respect to the cutting tool. Then the turned part of the rod is severed from its main body, leaving a solid tip portion -g upon the product B.

The next step in operations consists in sleeving member B over a mandrel C having anpaxial opening through which a small gun drill D is introduced to produce a jet orifice -h-- in the solid tip g. The reamed bore fits the mandrel and the gun drill therefore forms the orifice axially co-exte'nsive with the bore. Then member B is removed from the mandrel and the tip g'turned or machined concentric with the axis of orifice h. This may be accomplished by sleeving member B over a pair of centering devices E and F, nespectively, while rotating member B and bringin a cutting tool G against the tip g. )bviously, with orifice -has the center of rotation the tool G will machine the tip absolutely concentric.

' The next step consists in using this concentric surface of the tip to produce a conical mouth or flaring cavity -j within the tip so that the axis of the flaring cavity will be absolutely coextensive with the axis of orifice h.

"sleeving a bushing or pilot member H over the tip and feeding an end finishing and countersinking tool I through this bushing into engagement with the end of the tip, the tool revolving on an axis co-extensive with orifice -h. Thus, the outer surface ofthe tip, produced previously by=using the-orifice as a working center, finally centers tool I in respect to the orifice, and conmquently the flaring cavity is centered accurately with the.-

- or nozzles,-'.consisting in forming a tubular body with a closed end; drilling an. orifice axially within said closed end; forming a part of said body concentric with the axis of said orifice; and making a flaring cavity axially co-extensive with said orificeusing the con centric surface as a guide.

A method of producing carburetor jets or nozzles, consisting in forming. an axial bore and orifice in a cylindrical body; -ma cl ining a part of said body concentric with said orifice; applying a pilot member to said concentric part; and guiding a cutting tool into engagement with the end of said body bv means of said pilot member.

4. A method of producing carburetor jets or nozzles, consisting in forming an axial orifice in a cylindrical body; placing a centering element in said orifice, and revolving said.

body about the same; machining a portion of said body concentric with the axis of the" This may be accbmplished by pilot member; and forming a flaring cavity Within the end of said tip.

6. A method of producing carburetor jets or nozzles, consisting in turning a longitudinal section of a' solid rod to a predetermined shape; drilling said rod through and beyond the shaped section; turning additional stock fronr said rod; where drilled and beyond the inner end of the drilled opening; severing the turned section-from the rod at a point beyond I the'drillecl-opening to provide a closed end for said section; drilling an orifice axially through said closed end; and forming a flaring cavity within said end axially in line with said orifice.

7. A method of producing carburetorjets or nozzles, consisting in forming spaced cylindrical portions upon a solid. rod drilling and reaming said rod axially to a greater depth than the portion operated upon; forming a continuation of a cylindrical portion; reducing a part of the continued portion, to a smaller diameter; severing the section formed by the foregoing operations from the rod; drilling an orifice axially within the outer end of said part; and finally .forming a conical mouth therein axially in Iinewith vthe orifice. Y 1

8. A-method of producing carburetor jets or nozzles, consisting in forming a-cylindrical body with an 'axial' bore extending partially' through said body; sleeving the bored part of said-body upon amandrel; drilling an orifice axially through the unbored end thereof; 'sleeving a pilot member over the drilled endoi said body; and passing acutting tool through said pilot meniber to produce an end cavity within saiddrilled end.

9. A method of producing carburetor jets or nozzles, consisting in forming an axial bore within a cylindrical body; sleeving'the bored part of said body. over a mandrel; passing a drill through saidmandrel and forming an orifice co-extensive with said bore; placing said drilled end of said body upon a centeringsupport and turning a part of the outer surface concentric with the axis of the orifice; applying a tool guiding ele-' ment to said concentric part; and feeding a revoluble countersinking tool-lengthwise. of

said guiding element into said drilled end.

In testimony whereof I afiix my signature.

. ALBERT'J. WEATHERHEAD, JR.

orifice; and finally 'sleeving a revolving tool over the'concentric portionof the body, and.

forming a'cavity axially co-incident with said orifice.

A method of producing carburetor jets or nozzles, consisting in drilling a cylindrical body; forming a cylindrical tipcon said body concentric with the axis of the drilled opening; sleeving a pilot member over said tip; feeding a cutting tool lengthwise of said 

